fix: kill all IE processes when terminating browser process

closes karma-runner#15

index.js

@@ -1,20 +1,62 @@
 var fs = require('fs');
+var exec = require('child_process').exec;
 
-var IEBrowser = function(baseBrowserDecorator, args) {
+var processName = 'iexplore.exe';
+
+var IEBrowser = function(baseBrowserDecorator, logger, args) {
   baseBrowserDecorator(this);
 
+  var log = logger.create('launcher');
   args = args || {};
   var flags = args.flags || [];
 
   this._getOptions = function(url) {
     return [
       '-extoff'
     ].concat(flags, [url]);
+  };
+
+  var baseOnProcessExit = this._onProcessExit;
+  this._onProcessExit = function(code, errorOutput) {
+    var pid = this._process.pid;
+    killExtraIEProcess(pid, function() {
+      baseOnProcessExit(code, errorOutput);
+    });
+  };
+
+  // Spawning iexplore.exe spawns two processes (IE does that). The way karma kills the
+  // browser process (hard kill) leaves the other process in memory.
+  //
+  // The second process is created using command-line args like this:
+  //   "C:\Program Files\Internet Explorer\iexplore.exe" SCODEF:2632 CREDAT:275457 /prefetch:2
+  // Where the SCODEF value is the pid of the 'original' process created by this launcher.
+  //
+  // This function kills any iexplore.exe process who's command line args match 'SCODEF:pid'.
+  // On IE11 this will kill the extra process. On older versions, no process will be found.
+  function killExtraIEProcess(pid, cb) {
+
+    var scodef = 'SCODEF:' + pid;
+
+    //wmic.exe : http://msdn.microsoft.com/en-us/library/aa394531(v=vs.85).aspx
+    var wmic = 'wmic.exe Path win32_Process ' +
+               'where "Name=\'' + processName + '\' and ' +
+               'CommandLine Like \'%' + scodef + '%\'" call Terminate';
+
+    exec(wmic, function(err) {
+      if (err) {
+        log.error('Killing extra IE process failed. ' + err);
+      }
+      else {
+        log.debug('Killed extra IE process ' + pid);
+      }
+      cb();
+    });
+
   }
 };
 
 function getInternetExplorerExe() {
-    var suffix = '\\Internet Explorer\\iexplore.exe',
+    var suffix = '\\Internet Explorer\\' + processName,
         prefixes = [process.env['PROGRAMW6432'], process.env['PROGRAMFILES(X86)'], process.env['PROGRAMFILES']],
         prefix, i;
 
@@ -36,7 +78,7 @@ IEBrowser.prototype = {
   ENV_CMD: 'IE_BIN'
 };
 
-IEBrowser.$inject = ['baseBrowserDecorator'];
+IEBrowser.$inject = ['baseBrowserDecorator', 'logger', 'args'];
 
 
 // PUBLISH DI MODULE